Simulation Of Combined Energy Storage Characteristics Of Compressed Air And Flywheel

With the focus on energy issues and environmental problems in various countries and the carbon peaking and carbon neutrality goals of China,China has gradually entered a new stage of energy system transformation.Building a modern energy system with less carbon emissions,environmentally friendly,safe operation and high energy utilization is an important goal throughout the entire energy transformation process.With the relevant policies proposed and implemented,the creation of a new power system with new energy as the main body provides an effective way to achieve this goal.At present,the development of new energy in China is mainly in the form of solar and wind energy,wind and solar energy have unstable characteristics such as intermittency and volatility,these unstable characteristics put higher demands on the operation control technology and risk defense system of the power system.Therefore,the development of energy storage technology is very important both from the supply side and operational characteristics.Compressed air energy storage technology and flywheel energy storage technology are now mature technologies in China,the coupling of the two technologies can simultaneously meet the needs of charging and discharging time and specific power range applications.The coupling of these two technologies also allows for a faster and smoother response to grid regulation commands,and responds to grid regulation commands more quickly and smoothly.This paper focuses on the compressed air energy storage system itself,as well as its hybrid energy storage system in conjunction with a flywheel energy storage system,through the following studies,the following studies are carried out:(1)The basic principles of CAES system are analyzed,and the mathematical model and simulation model of compressed air energy storage system are constructed on these basic principles.Under design working conditions,get the simulation of the static characteristics of a compressed air energy storage system.Comparison of the data obtained from the above simulation with the actual operating data,and in this way the accuracy of the model is verified.(2)According to the grid connection process for compressed air energy storage,adynamic response model for the start-up impulse speed and power regulation was developed.The response of the compressor and turbine in an adiabatic compressed air energy storage system to a continuous step signal command has been simulated and the results show that the dynamic model can follow the command signal quickly and smoothly.(3)The two regional power grid model is established.And the flywheel energy storage model is coupled on the basis of the compressed air energy storage system model to form a joint energy storage system.Then simulate the frequency regulation characteristics of the control area when the compressed air energy storage system is connected to the two regional grids alone or in combination with a flywheel energy storage system.The results show that whether in the primary or secondary frequency regulation process,the energy storage system can be accessed to improve the frequency performance of the control area.The result also shows that the combined energy storage and frequency regulation system has better frequency regulation characteristics.